c. Diversify Brands of Hardware Wallets: Some coins can be stored in Trevor while the remainder can be stored in Ledger Nano x as the case maybe. This way, bug or an exploit in one type will not compromise everything.
Trezor is good, but why Ledger?
There are better hardware wallets than Ledger.
[LIST] Open Source Hardware Wallets.Thank you very much @SquirrelJulietGarden for sharing that useful link, I have updated it now.