Using only seedsigner to setup multisig wallet

Looking to setup multisig wallet and was thinking of using seedsigner to create a 2 of 3 then storing my seed phrases on crypto steel plates or QR code sheets at different trusted locations. This is for long term hodl storage so my thought was getting a ColdCard Q (seems like this is best hw wallet available today) is overkill since I don’t really need ease of access. I know it’s probably “more secure” to use three different hardware companies but I don’t think it would be much difference since seedsigner will be completely air gapped. I can also just recover wallets from seed phrases in future. I’m I on the right path here for creating the most secure wallet? Am I missing out on some security feature that ColdCard offers, but seedsigner doesn’t? I also have ledger nano s and x but don’t want to use them anymore.