The techniques you need to follow for B206 confined area ops are those you would already know for the R22/44, and they are the same for B212 or any other helicopter you might care to mention.
You will not whack the stinger landing at the downslope limit if the ground is otherwise clear of obstacles. I'd be more worried about an easy looking landing on flat ground and whacking your tail on something sticking out of the ground that you didn't see, or that you did see but forgot about, or misjudged. Depending on the soil type, on down slopes close to the limit the B206 tends to slide forward as you lower the collective - apply due finesse as you lower the collective to arrest the slide, use absolute minimum aft cyclic only if you have to, and keep it pointing straight!
When landing upslope, the helicopter will not slide backwards but I like to be drifting forward ever so slightly at the touchdown point and keep the cyclic slightly forward of neutral. When landing in a confined area I choose as first priority the option that gives you a safe tail rotor clearance, don't care whether it's up/down/cross slope as long as the slope is within limits. That's very important on the B206, the published limits are real value limits, try taking it past these and you'll know about it.
Make sure you brief the passengers to leave the aircraft down slope and clear of the tail, not much point in greasing the most difficult confined area slope landing only for a pax to walk up slope and get whacked by the rotor. Nominate one of the pax to be responsible for the others, because sometimes you just can't get out of the helicopter when it's running on a slope. This is my biggest worry in these situations, having un-escorted passengers around the helicopter when I'm obligated to remain at the controls due to the nature of the landing point.