The ones from coinkite are nice because they are sized for their steel plates, but they are pricey. Amazon has good options, and yes get opaque ones. 

Yeah ideally you would keep a hardware wallet in the security box. You can still put a seed phrase in there if needed if you SEED XOR the seed phrase and use tamper evident bags. 

 Is SEED XOR difficult to setup already having the wallet established within CC?

Ill be honest, always nervous messing with my wallet settings after having everything setup, validated, tested and re-tested. 

 No, it’s really simple. There are resources from coinkite and BTC Sessions, but it’s a simple process. SEED XOR doesn’t change any settings within your CC or private key. You’re just creating/deriving a multi piece seed phrase from the original seed phrase.