You say you want to adjust the height from the top of the table.... a router lift. Some routers have this feature builtin, like Milwaukee, Bosch etc. As far as building your own lift, most fixed router bases you have a spin the motor to change the heights, then lock it tight to prevent vibration from changing it. This is why router lifts are so popular, they do all this with one tool from the top.
There are nice router lift plans on Ebay. One of our members, Al B Thayer, designed them and he has made videos to show how they work.
Most really good router lifts cost more than a good router, so beware. I use the Jess Em Mast R lift 2 in my tables with a PC 7518 3 1/4 HP router. It walks through anything I've used it for. The Jess Em has a height lock cam which prevents vibration from moving the bit height.
Don't forget, a router table fence need not be parallel to the table edge. The fence cane be clamped at one end or bolted with a pivot bolt or have slots on either side of the bit. Obviously, your T track would want to be parallel to one of the table edges, however.