Tamukeyamas can take more sun and heat than most red dissectums. However, most red dissectums seem to do best when protected from hot afternoon sun. The ideal situation for most would be morning and/or midday sun with afternoon shade.

I have a Red Dragon and Crimson Queen that keep their color all summer long, one with morning/midday sun, and the other with midday/afternoon sun. My Garnet gets morning/midday sun and loses its red coloration by June.

Although I don't have a Tamukeyama, my understanding is that they hold their color better than most red dissectums. So it would probably have deeper coloration with more sun, but would probably retain some of its red color even if shaded.

Thanks Dawgie! Couldn't find a great full sun spot for her, so she appears to get some early morning direct sun followed by some filtered sun and shade for the rest of the day. Will see how she does!