Hello! I'm a new reptile owner and in about a month I'll receive my ball python, I'm setting up everything before he arrives.

I have a 4x2x2 melamine enclosure, at this time of the year my house is normally around 18ºC (64,4ºF) give or take.
I was thinking about buying an 80w deep heat projector but I'm afraid that might not be enough and maybe I should buy a 2nd heater.
The breeder said they use an under-belly heater but I'm not sure I'm confortable having that inside the enclosure. I've also read about radiant heat pannels but sadly those don't exist in Europe. What would be a good solution to pair with the RHP?