There are few wallets that I am aware of like Atomic wallet, trust wallet, Tezos and ledger.
Are there any more and do they all support multi cryptocurrency staking also?
The above four do support staking as per my understanding.
There are more multi wallets that support cold staking too just like bitgo, coinomi, cobo. that makes me get a little surprised to see that if all of the major hardware wallet providers have already supported staking.
Im using coinomi and im doing cold staking right now on my wallet. It's really simple to do.