Plungin Really Simple SSL is not necessary.
It is enough to install the ssl certificate, then change the http paths to https in the database, you can use the plugins “Better Search Replace”
And if you use elementor you have to use its tool in: Elementor -> Tools -> Replace URL
Ad you will have to add in the htaccess the command to always load the ssl version.
This way you can also save a plugin because the better plugin can be erased later.