How could a tungsten fresnel - and 300W at that - be dangerous at 2 meters from behind? It's not an HMI where you can get UV exposure if, say, a back lid is missing on an ancient 70s HMI fresnel. At 300 Watts neither does it heat up a small room too fast, even though something like 270W (compare that to a couple kilowatts that radiators and heat fans consume) goes into emitting infrared (some is focused into the beam, the rest heats the body).
It's not that easy to start a fire with a beam of a 10K fresnel, a 300W can hardly melt foam if very close. It's VNSP pars and other pinpoint sources that burn gels and ignite things all the time. Make sure though there's some space and nothing flammable above the fixture. Remember school physics - convection? All the hot air from the fixture goes up.