1st Floor of which building? I went to Bakers today, but there were no Genetic Repair Meds to be found in any of the large lockers. Seems this is very much RNG luck.
Good settlements for these are the large or medium pad industrial settlements with a single landing pad. Industrial production building, ground floor, main production room, in the large locker by the window. There's also a narrow upright locker at the back of the same room that can also spawn them. They also spawn ionised and compressed gas canisters which are used in a lot of weapon mods. The large one also has a locker in the CMD building which is good for suit/weapon schematics.
Another good prospect is the production building at the large extraction settlement that also has a small landing pad and a combined command/hab building - upper floor of the production building also has a large locker that can spawn genetic repair meds and the gases. This base is less good for the genetic meds as it's only the one locker, but it's a very good data farm for its four hab ports (two in the warehouse, two in the hab building) and security ports.