I'm looking to install an Electrum server. Only condition is it can be used to serve multiple wallets at the same time so Electrum Personal Server is not an option. Currently I'm looking at Electrumx and Electrs

1. Are there any other projects I should be aware of?
2. Can I use Electrs to serve random users from across the internet like I can with Electrumx?
3. What are the general benefits and drawbacks for both?