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Measure how far away your car unlocks, then keep the keys as far from external walls as that.

But to be honest it’s easier to keep them in a metal box that shuts properly. That’s what i do (although my fob still needs interaction, so i should be a bit safer, in theory).

Also consider that keyless cars actually still have a way to enter, be it physical or remote: garage-supplied universal keys and software. VWs for example have an old-school keyhole under a thin plastic bit on the door, so that garages can access it when you lose the fob.

Thieves are boosting the fob's signal. So it's not practical for car owners to measure a safe distance.

The criminals will be using more sensitive equipment than what the car is, so "Just far enough way that the car doesn't pick it up" is bad advice.

There really is no safe distance. A better antenna will be able to pick up the signal no matter how weak.

I'm sure if you stick a fob up your ass it'll dampen the signal a bit too.

Or you know, maybe put a button on the fob.

They make Faraday bags (many options) for this purpose. That is where you should store your fob.

Just put them in a Faraday cage, problem solved.