I forgot to mention one very important aspect of this.
Mount it where it is in YOUR comfort zone to work!. I have the jet hooked into the mediocre shop vacuum system and then use the long hose on my small vacuum if I am doing any serious sanding.
I use a long plastic tube to extend the hose and keep it in place. (I think it is an old golf bag tube, not sure) I heated the end and made it to slip on and off my hose end. It slips in between the plate grinder angle adjustment and the main body and stays well. Helps control more of the dust--. I use mine vertically by far the most! I di my old junk one also. Try that; It may or may not work for you, but, does for me.