Imagine you are living a big family house because you have no choice and you got to invest some money in Bitcoin and store them in a hardware wallet, then you have a safe beside your bed where every can pass by how will you make sure no one goes near out?
A friend said he had to set up an alarm system in the locked safe so that he can be notified on phone when someone opens his safe where he kept his hardware wallet.
I don't know if this is a good idea but I will like people's opinion about this, if you are living in a crowdy house basically a family house how do you keep your Bitcoin wallet safe?
IMO, it's ok to have an alarm on the safe, but that's an added layer of protection, not the primary one — once someone tries to open the safe, the alarm will alert you.
So, if I was in your situation living in a crowded house, here's what I'd prioritize:
Don't store the seed phrase backup in the same place as the hardware wallet — if the safe is found, so is the backup!
A passphrase (BIP39 25th word) – this is the most important one, if the device is found or stolen, it cannot be used without the passphrase which is meant to be stored in your head.
Do not place the safe in a conspicuous location; the less noticeable the safe, the less likely someone will be suspicious.
Don't let anyone in the house know what is in it — trust me, this is probably my biggest tip, because the riskiest scenario is usually someone in the house already knowing what's there and getting curious.
So I guess the mix of passphrase and distributed backups and minimal disclosure is works a lot better than just an alarm. This is just my own take/opinion, though — perhaps others here have other ways of doing it that are better suited to them.