An AED does not need installation, when you receive it, you only need to remove a battery strip and after that the defib will do a self-test.
Does a defib need to be connected to power/socket?
Are you registering these defibs on www.thecircuit.uk or do your customers have to do this themselves?
"Where can I register my AED so that it is available for everyone? (NL)/(UK)/(FR)"
