Got my two bikes in a shed.
Its one of those windowless ones with double locking and an alarm.
On the inside I'm using a dead weight (in this case a neutral CT from a 132kV transformer – small but very heavy – bout 70kgs) and expensive chain and lock to secure them.
It seems like if these thiefs want the bikes then they will get hold of them what ever. If they are carrying cutters that can get through expensive locks and chains and they have vans waiting then what can u do? Mine are insured so at least I can get a replacement if nicked.
Would be hesitant about storing in the house – if thiefs know I have a few grands worth of bikes to nick then I don't want them to attempt to break into my house when I'm out – or worse still when I'm out and the missus is in!