but I couldn't find a wallet that supports pay-to-taproot multisig, does anyone know any wallet support it?
Currently, there are two wallets that support P2TR and multi-sig but I am afraid none of them are going to be useful in this case cause these two come only with a subscription so it is going to cost a few hundred bucks a year.
Yesterday we were talking about how multisig transaction fees can be extremely low using P2TR
Yeah, you are right with P2TR (Pay to Taproot) multi-sig the size of the transaction will be almost half that of size P2WSH (Pay to Witness Script Hash) transactions but still it may take a while for the wallet developers to come up with stable version which supports P2TR multisig.