security and spam protection plugin that works with GiveWP

Hey Matt and GiveWP team!

I’m using contact form 7 and we’re receiving too many spam and ads messages. Also, I’m worried spammers/attackers might target GiveWP donation form. So I’m considering installing a plugin for security and spam prevention. I like Wordfence but it makes the website slow. My question is, will any security or spam prevention plugin cause conflict with GiveWP? especially that we’re only using PayPal standard and I’m worried that the security plugin might prevent IPN messages from reaching the website, so which plugin you’d recommend in this case?
we’re based in Turkey so we can’t accept Stripe and we can’t use any of the payment gateways you provide, so we have to stick with PayPal for now.

Many Thanks!