Is it not possible to say "Kamu di rumah"?
You could say that in daily conversation.
Setiap masa aku bangun kami ada di hotel sedang merangkai sebuah denah bangunan kita ayo makan marilah makan dengan bala-bala,karoket,cireng,gehu,sama lotek tenang tenang jangan marah marah kita disini enggak mau musuhan
'Ada di rumah' basically means 'Be at home' whereas 'di rumah' alone means 'at home'
isn't rumah just a house not necessarily a home?
home/house = rumah