I do that in several ways. I frame in a box type system which uses no passparteout, which is very difficult to get in museum grade for those sizes. Anyway I am not a big fan of passeparteouts.
This looks very well granted you have white borders around your image, otherwise it will look crammed and the frame may cast a shadow on the image itself. The limit is the glass size for me, where I live it is 240 cms.
The other way I mount and has worked very well for me is that I cut a glass the size of the print, I always leave white borders, and simply sandwich the print against the wall, you could even use mdf board as a back, and then clamp everything into the wall itself. Pretty simple low tech solution.
That worked well enough for a 45 day exhibition I made far from home. When the show was over I simply gave away the glass and rolled the print and mailed it. Far cheaper and prctical than mailing big framed prints. It is not an archival museum grade mounting system, but it works, and is low budget.
Nowadays I never frame prints for exhibitions. I don't have enough space to store them afterwards. What I do is sandwich the print between mdfboard and glass and clip them together. When the show is over, all the prints go into a box and the glass/board sandwich into another, waiting to be reused for the next show.