Are you sure that’s a good idea? Personally I’d have the controller higher up the wall and the FCU in the adjacent room. If you are using the under floor sensor maybe you should have the controller in the adjacent room too
One of the most stopped stupid installations I fault found was where the...
@ £1300 for a new CU and smoke alarm for a flat
Get some quotes as you are under absolutely no obligation to use the spark who gave you the unsatisfactory EICR
If this is a rental bear in mind you’ll need an EIC for the consumer unit installation, probably an EICR and a part p compliance.
Regarding the smoke alarm, battery or mains? And is the only 1 in the property. Avoid cheap rubbish and specify Aico is my advice