If your property is served overhead , in the past the installer probably would prefer to install the master socket in a 1st floor room ( normally a bedroom ) as it’s less cable on wall , but as the fibre from the pole has to terminate on a CSP , before continuing to the location of the ONT ( using a different optical cable ) then the splice that is required in the CSP would be easier done on the ground floor , not at the top of a ladder.
To do what you want , would mean that the cable from the pole has to attach at a eves level , then be run to the ground floor level, then the ‘internal’ cable run back up the wall to the first floor level then taken inside the property , chances are the installer would do this , but I doubt you could get a guarantee that if the installer didn’t do exactly as you wanted you could simply say don’t bother …having said that , if after discussion about where the cables should run, you were not happy with where the installer was prepared to fit the ONT, (but before work starts) , you said ‘don’t bother’ , it’s likely that the job wouldn’t be booked off as done, giving you the opportunity to cancel the order.
