But, in short, is it possible for me to choose 3 or 4 different servers, to all be connected to Electrum?
No, just one, let's say "
main server" of your choice.
The rest (
peers) are just for security purposes since you can't just trust that a random public server is giving you accurate information.
And those don't have access to your wallet's addresses so it's not bad to keep it randomized.