We are doing the exact same thing.Since I've decided to only buy EV's in the future...I had an extra 220 service run to the house...cost around $1,000. I installed 3 Tesla chargers in my garage using this new service. The reason I chose Tesla wall chargers was because they can network together and can move the amps around based upon how many of the chargers are in use at a single time. Then for non-Tesla EV's I've purchased Lectron - Tesla to J1772 Adapters. This way I can have my Model 3 and my Rivian R1T all charging at the same time - and even have one more for a future roadster (just dreaming on that one).