The aaxa 4k1 mini projector delivers a lot for such a small form factor. The projector its self is 3.8lbs(1.72Kg) measuring about 21/2" tall, 71/2" wide and 81/2"deep. As it uses an external laptop-style 19v power brick, you will need to keep that in mind for mounting and if taking it with you. If you were to include the power brick, I am sure it comes in between 41/2 to 5 pounds.
The projector can be mounted in various orientations, there are 4 mounting points on the bottom of the projector so you may ceiling mount it. It also supports tabletop and rear projection. Which would allow you to use the aaxa 4k1 in a variety of scenarios. Although, with the external power supply that leads to other challenges when installing it on the ceiling. The power supply is as large as the projector.
The airflow of the 4k1 is a crossflow pattern, going from left to right as you are looking at the back of the projector. This allows you to back it up to a wall, but you will need to be careful if you put it on a bookshelf, you don’t want that hot exhaust circulating back into the intake.