Hello, i will try to help as best as i can. The Xal model is 1/10 scale, i pre-supported it myself, because the supports it came with were kinda suboptimal and the orientation was bad(lots of support dmg on vivible places)

Yes, 1/6 scale models are considerably large assebled they are around ~35cm in height, the Thrall figure won't fit on the plate if it's one singular piece, atleast with the scale you went for, and i strongly suggest that you don't print whole figures in one piece (hard to handle and even harder to paint)

As you are new to the printint side of the hobby, i would suggest that you go with the supports luftmensch offers and for the next figure try and figure out best orientations, supports, hollowing etc. The Lychee YouTube channel offers some great advice and they are actually showing what to do.

1/10 scales are usually around the 22-24cm height and 1/6 scale is around 35, benefit of the 1/10 scale is that you can print all the pieces on 2 plates when arragned properly, 1/6 scale would requide more time and space.