bell transformers have some exceptions but not off a 32 amp ring main mounted next to it lol, some transformers now made to fit directly into cu been around for a while tho
G2 are bit easier for home users I think, GD48 has advantage of telling you open zone in setting, but then g2 offers you the part and night set options for a home user a little better , rather than the gd with a and b key and using codes and extra tags for what you want
G2-20 or g2-44 would do the job?