I have one correction the second plant I had I ended up putting in a tree fern pot and it has taken to it quite well, sending out good roots. From the choices you provided I would chose growing under the tarp. I grow mine outside in lower level vanda light. I have heard a lot of people advise to grow them in phal level of light, but mine have always been in higher light than that. The AOS culture page for this orchid gave a wide range of medium to use and light levels, if I remember correctly. My experience with this plant may be different than yours, I have transplanted some orchids that have a reputation for being fussy and no problem, and have done some that are not fussy and lost them.