I run a core node + electrum + neutrino just fine.
Indeed in the same LAN you can have it more compartmentalized if you want:

• 1 central core node that serves multiple other connections. But on this one you need to just activate neutrino service. It doesn't take too much resources.
• multiple electrum servers if you want to run them separately
• multiple LND, CLN nodes pointing to the same core node
• LNbits, Alby also can be on separate machines pointing to a LN node etc