WP-Shield or Shield Pro is good too. I use them one of my clients.
Using BPS Pro (commercial but one-off payment for unlimited sites - there is also a free version) and seems fine on three sites Iām running under ClassicPress.
The plugin author seemed willing to look at issues with ClassicPress when I contacted him (see thread and link at https://forums.classicpress.net/t/bulletproof-security-pro-and-classicpress/289
IThemes Security works OOB
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@pieter I am moving your email to a dedicated post so I can reference it in the future 
Thread has been deleted.
Ahhhhh, such a democratic system
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First of all, love your name. Secondly, āOut Of Box?ā
Iād laugh if I could. Thatās why Sucuri and WordFence rule the roost when it comes to WP security. Iāll reach out to Mark Maunder at WordFence and then Sucuri and see if any of them will respond.
I think at this point, itās very clear that Mr. Mullenweig has heard the siren call of investors and stake holders telling him he must compete with Wix asap; and is sending everyone and anyone who gets in his way under the proverbial bus. Hence all thatās occurred. As much as I love kindness and generosity of spirit as a Buddhist, as someone whoās grown up around military personnel and worked for many āold schoolā marketing agencies I also see the value in reading between the lines and knowing that untrustworthy critters can lurk in tall grass as they say. I wouldnāt put it past anyone at Automattic (and their subsidiaries) to play nasty with CP. Therefore, I would not afford them the opportunity.
Update on this: Concerning forks and recommendations on the forums ā Make WordPress Support
As mentioned in the post, we encourage anyone having issues with the WP forums to reach out to them on WordPress Chat in the #forums channel.
Yes, āOut of Boxā. No detected issues since I switched to CP three days ago.
Do you know the source of my name?
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I am afraid to ask.
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Is that so? 
I thought you knew! Itās just a character of the 1980s UK TV-Show āThe Comic Strip Presentsā, but now we are far off topic, so letās stop here.
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Iāve added my voice to the WordFence/ClassicPress thread on the WP support forum. Probably a busy time for them so might take a while to get anything back.
Meanwhile Iāve loaded up All in One Security on a site and it looks good too. Happy to go along with whoever comes to the party. 
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How would one be able to āPlease support ClassicPressā on the WordFence (or any other plugin) support page without spamming them and therefore harming the idea behind it (supporting CP)?
Any advice on this, cats?
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Just make a single post asking about it and you should be fine. If youāre not moving from thread to thread and adding virtually the same comment, itās hard to think it would be seen as spam. If a lot of different users are asking for CP support, thatās also not spamā¦itās a trend.
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Done:
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Iāve seconded your post @Webrockers - I should also point out though that we do have some very good alternatives now - as listed here (Shield is free and Iām using that on all my sites)ā¦
By the wayā¦ welcome to the forums! 
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This was just posted on that issue:
Thanks for the feedback!
We have been closely monitoring the forums, blog post comments, and support tickets. We assure you that all requests are being documented.
Currently there are no plans to support ClassicPress. Though this may change with the influx of forum posts and interest in ClassicPress.
We ask for patience and understanding in the meantime!
Thanks,
Gerald
So I suggest you investigate one of the CP-friendly alternatives listed above.
WF is still working fine on my site. I use MalCareās free version to check the core files every day, so that makes complete protection. The LiveTraffic feature is indispensable for troubleshooting.