Helping a friend setup 3/5 multisig for deep cold storage i.e. no need to spend for multiple years. We've identified 5 secure locations for each of his hardware wallets (1 at his home). However I'm not sure where to store the seed backups (cryptosteel). I know some store the seed backup with the corresponding hardware wallet but that obviously makes compromise of a key much more likely. Having to find and manage another 4 secure locations is too expensive and time consuming.

We're now considering setting up the multisig with hardware wallets and then wiping the seeds off them and only storing the seed backups in the secure storage locations. When we need to spend we recover the wallets from the seeds at each location. Any issues with this?

How do you manage your seed backups for multisig?