If you go into a house once your inside that interior you added with /createhouse
Press and Hold F1
there you will find house interactions and can then add in locations for all of what your wanting clothing, log off, and stash is all setup using the F1 Wheel menu. Each player that buys a house for instance can go in and set and add locations to there own choosing… As for the Starting Apartment that is not the same.
I am currently working on the same thing right now myself. If you have any specific details on anything feel free to reach out anytime. I work with qb-core daily. Download resource below just drag an drop in resources and start it in server.cfg go in game and you can spawn into any interior you need offsets for and it will give you offsets for that exact interior cords
youtube.com/CodyRossLive
Too note fully understand the frustration it took me around a month to figure it out myself and I’ve only just now figured it out.