I know I've seen guys post about using it, but I can't seem to find any of the old posts. My question is for the the people who use it, how do you attach the clip hangars to your boards? Also are there issues with getting the fur over the clips while putting it on the boards? Thanks

I never used it but I would do a google search and look at what's available in connectors.
If you hang your boards nose down, which is the way you should hang them the clip attachment won't be a problem.

Are you committed to using Unistrut? If not just take some 1X2 boards and screw in some cup hangers, then attach it to wherever you're going to hang your fur.

If you are using split adjustable boards you can cut up old wire hangers and bend them so they’ll go in the mouth (in between the split in the board) and hang them that way. Doesn’t hurt the fur at all. Easy to put on and off.

This is what I did with Unistrut.

Photo 1, close up of hanger on a solid wood board. The hangers, when you get them are bent in a half circle to fit electrical conduit. You take a hammer and block of something and flatten out the curve. Use the existing hole in the hanger to attach the hanger to the board.

Photo 2, boards hanging on struts ready for this season start.

Photo 3, close up of an adjustable board and a solid board. On the adjustable board the head of a hex bold messes with the ability to completely collapse the movable side of the board. I have been putting it off but am going to replace the hex bolt on the adjustables with a flat head bolt that will be counter sunk even with the surface of the wood. That will allow the movable board to completely collapse. They work fine with the hex bolt but it annoys me sometimes when I want to move the adjustable all the way to the closed position. I'll put the nut on the other side of the board to make that work.

You can also make different kinds of hangers to fit the Unistrut. You'll see some hook hangers in the first photo. Those are made with some hardware from big box store and using fender washers that fit in the Unistrut track. You might need to grind a slight flat on one side of the washer to be able to tilt the hook and put it up in the Unistrut to hang it there. Takes a little fiddling around to get it just right but once you get one right then you do all the rest the same.

If there are any questions please ask.

That will work. I was about to post the hook set up but a picture is worth a 1000 words.
You can buy Unistrut nuts that have a 1/4" thread. Then get some 1/4" all thread and bend a hook on one end.