Once you learn the most basic way of doing a task, that is when you should advance to the next, better method.
You should know how to sweep a table with a DTI. It is a pain in the butt, I have to admit. I hate it. It takes nothing for it to snag on the tee-slots if the mill is out more than 10 thousandths or so.
A normal dial indicator is not as bad, though.
But once I got that down, I made a 6" EZ-tram type rig. It works great, very easy. Simple to make - a square stick with a shank pressed in, two 3/8 holes. I used split clamps on mine, a set screw would be just as fine, for holding the indicators.
I donated it to the school I went to, though. It will probably be forgotten and thrown out, but I don't need it.
Anyway - not sure how factory-made EZ-trams, are, but a homemade one is not as simple. The two DI's may not be exactly in the same position (by may, I mean aren't - it helps a lot if they are similar though). To use one - put it in the spindle. Get a 1-2-3 block, gage block, small surface plate, etc. - a flat piece with two parallel sides - and put it on the table. Position the table so both DIs will be able to hit your precision block, whatever it may be, by turning the spindle.
Zero both indicators on the block. Then, using the knee, lower them to the table. See how the difference is, and correct as needed. Going off of one dial as the "master" dial and the other as a reference dial, get them both to 0.
There are some good YouTube videos on tramming a mill - one by our pal Tubal Cain, the other by some guy from the northeast, in particular.