Security plugin

Hello again,

I hope ou can help me with this problem did you test any security plugins with your site, i’ve purchased this one https://codecanyon.net/item/swift-security-bundle-hide-wordpress-firewall-code-scanner/10143693?s_rank=3 Swift security plugin, but when I install it and activate it crashes whole site, there is no way to ented in admin area and live site also does not loading at all.

Can you recommend security plugin?