Re: DVD Player ????
All depends what u want. You can get roof mount screens which fold down from roof, range in size from 5.6" - 17" maybe bigger. Headrest mount in back of head rest, 5.6" - 8", in dash usually where the head unit is and it pops out and up 5.6" - 8" screens which strap to your sunvisors. But as DansEdgli suggested may be your best bet unless you want something more permanent.
I have a clarion 6.5" indash widscreen sitting above an alpine head unit, which is connected to a PS2. I take the PS2 out the car so it is used for multi purpose.
2000 AUII Forte [RICEAU]
In Car Entertainer