Shallow! Absolutely! Make the approach slow, shallow and with no big power pulls at the bottom. Test max power before you start the approach, and note the torque MP that you have. As you decelerate on the approach, you will naturally bring the power in, so watch the power carefully, and if you get close to limits just nose down a bit and fly away (it is easier to fly away from a shallow approach than a steep one, PACO!) NEVER commit to the hover if therer is insufficient power.
The worst problem in an altitude landing is arresting the descent with the last bit of power at the bottom. If you are steep, you have a higher rate of descent and a bigger need to suck in power at the end - both factors help you fall through and hit hard if you misjudge (in fact, you will then call it Vortex Ring State, so that you are not at fault, Nature was!)
The only time to be steep is if you need to be for some other reason on the approach, such as obstructions.
Land crosswise to the wind, never from the downwind side. Often 45 degrees to the ridgeline works well.