Install where? TCP model already comes with GPS

What do you mean by install GPS? Installing on the head unit itself - no cannot. Or did you mean using Apple Carplay / Android Auto on the head unit? Or did you mean using Waze / other GPS software on the phone to display at the head unit?

Ha3! I also do this
Can either try to do as per the above suggestion (open waze on phone, charge it using USB cable connected to the below console, put it horizontally at the space/gap between the HU and aircond.

If you use Apple CarPlay, you can only use Apple Maps. If you use Android Auto, you can only use Google Maps (for now, Waze will be coming *soon*). If you want waze, you can either use the above method OR use a HDMI bypass cable. HU can only mirror while on parking brake. It will disengage mirroring once you disengage the parking brake as a safety feature. You can view the demo video on Apple CarPlay and Android Auto at the first page, 2nd post.