eBlockerOS HTTPS CERTIFICATE install arch

Hello everyone. i would like to use the tool eblocker to block ads and trackers. to do this i would need to install a HTTPS CERTIFICATE under arch linux to be able to perform system updates**.

Can someone help me how and where I can install this ?

Why you wouldnt use adguard or equal?

I use adguard home with unbound. Just wanted to have a look at eblocker.