One problem with AirTags is that Apple have put in an anti-stalking warning. If parted from it's paired phone for too long and in constant range of another phone, it'll both bleep and sent a message to the victim's phone to let the person know that they've got unauthorised tag tracking them. As far as I know you can't disable the feature and whilst it only used to work Apple to Apple, I understand Android are issuing an update to make their phones compatible.
Now this anti-stalking warning is both good and bad. Good in that the thieves may think, sod this, I'll just dump the bike, and whilst not perfect, you've at least got a heads up on where your bike roughly is; Bad in that the bleeping will guide them to exactly where the AirTag is hidden! There are however many videos on Google telling you how to remove the built in speaker.
Bottom line, despite their limited effectiveness, for the modest outlay involved I've got one hidden inside the RT. Okay, if I can hide it, the criminals can find it, but that's going to involve removing an awful lot of tupawear and if the cons are that keen the bike's probably been stolen to order and I'll never see it again anyway. If it's just been nicked by the local scrots, maybe it'll help.