breeding can be hit-or-miss with any uroplatus. for one, eve has taken excellent care of her geckos for a long time now, longer than i've been around here, and only recently got fertile eggs. so dont necessarily expect to get a trio and move them in front of and away from each other and to each time go at it. i admit, a lot of this has to deal with luck. even being lucky one season, you can get nothing the next. no one knows whats going on in these tiny heads of theirs.
good luck getting your hands on henkeli right now. your best chances are finding some CB, which isnt the norm for any uroplatus. the only reason for that this year is because the quotas were set very low for henkeli, i think only 200 or so were supposed to be exported as fresh catches from madagascar. expect prices on them to be as high as some of the relatively uncommon species such as pietschmanni.
these geckos cannot tolerate neglect. pretty much daily care is needed cuz if you skip a day, murphy's law dictates that that will be the day your gecko(s) get ill, and any illness/disease/injury needs to be dealt with ASAP, from dehydration to parasite overloading.
in my honest opinion, not backed by any data or anything, i would say any uroplatus does better in a natural setup, granted it is set up correctly. you need proper ventilation, humidity, temperature, and it's even good to check to make sure none of your plants are toxic. of course no one should be putting anything like a cactus in their enclosure...thats pure common sense.
henkeli do tend to be one of the more commonly bred uroplatus species, so hopefully you have luck with them. final note, make sure if you buy some you get them from someone reputable. it's not too uncommon to find a decent price on them from someone, but when you get the animal you find out they're in crap condition or even on their deathbed. life/health guarantees are fairly strict, and if you dont play by their rules you can easily get screwed.
so once again, i wish you the best of luck.