Hello, first question yes: GU10 base. Regarding detection if the serial number is not present or not recognised, you can reset each individual bulb (press remote on and off at the same time close to each of the lights for about 10 seconds until the light brightens, turns off and turns on again normally. Then the bulb will be recognised when searching with the hue app. Have fun - Philips Hue are really great lamps.
By the way, I had the same problem that Bridge did not recognise the spots. After entering the serial number, however, everything worked without any problems!