Where I live guns are not easy to get hold of (thankfully) as I am not in the USA. I am looking at fireproof safes, cameras and other things (like paper wallets with a few in, but not many) I can give up if pressed that don't give away the real stash.
I already have property I have bought overseas and some development land I have picked up, so I know if I lose the lot, I will still have something left from this ride, no matter what happens. I am getting tired of worrying about private key security and how I leave instructions for my family that they will understand (if anything happens to me).
I gave them $100 of Monero way back and it went up massively, so they all understand a bit (I gave them it when it was around 30c a pop) so they do realise it's become a lot of money! But they are slow to get the 'this is your private key - if you let this become unsecure - you lose it all' bit. What can you do?
If it goes up to 25K a coin, I will cash out a fair bit - buy a beautiful Aston Martin and make a really complicated will!
If you want to ease things for your heirs, buy them or tell them to buy and learn to use a hardware wallet. If you have a considerable stash you may have it distributed over several different hardware wallets (same or different brands).
About the fireproof safe.... If you are intending to store the "single" copy of yours keys... remember that no fireproof safe is really safe nor completely fireproof. Redundancy is key here. Offsite "backups" are a need. Also for storing things long term it is better to bury them into the walls, floor, or whatever even if you already have a safe. If buried well enough, even if you get hijacked and tell them where the "stuff" is, they will need time, tools, and a lot of noise to retrieve it.
About the security cameras, make sure they run on their isolated vlan and if you do ever intend to access it from the outside use an VPN access at home. Never ever let those buggy devices share the same lan segment you do use for your "crypto" things.
25K sounds like a lot right now.... but not as much as 3K would have sound before 2013. Time will tell.