Block Spammers / DDos

Hello,

I need a plugin to protect my website from spammers / DDos attacks. I mean, I need something simple to block any user after X number of page requests (200 page requests per hour for example).
I’m having stupid spammers from different locations and different IP’s causing loads on the servers browsing everything. I only want to grant full access to google bots.

I’ve installed last week Wordfence (which looked great) and added some firewall rules, but that doesn’t seem to prevent anything.

Many thanks,