Ok, so the ERC20 address works for both networks. Just to see what we have in the RSK network (SOV token) we need to switch it in Metamask and the same way we have to do to see other Ethereum tokens? Correct?
That's correct. I think that you must also noted this if your ERC20 address will be activated on the RSK mainnet when you have been sending something to your wallet just like RBTC. It doesn't require a lot of rbtc.
Your address will be showing on RSK explorer when you have ever deposited RBTC to your walelt.
You must have noted this as so many people are still confusing about the correct procedure to use their wallet on RSK mainnet.