Indeed so.
The other and even cheaper way to do it, is to place the key(s) in the house. Then go outside and see if the vehicle will start. If it doesn’t that’s very possibly good enough day to day, unless of course the thieves have some sort of signal booster, which they might well do.
But don’t - even with a Faraday pouch or box - be tempted to put the keys down on the hall table, saying “I’ll put them away later”. Also, try putting the key(s) into the Faraday pouch / box and then go outside to see if the vehicle starts. Why? It’ll make sure that the (possibly) shonky Chinese Faraday box / pouch isn’t just some load of junk you’ve bought off Temu, ‘cos it was well cheap, mate.
Or, in short, DON’T keep any key(s) in the garage…… even if you think it’s “Not my fault” that the vehicle is then started and stolen. One thing’s for sure, it’s not the fault of the vehicle’s insurer, though they’ll make good your loss….. which then begs the open question…. who’s fault is it?