I have not seen that one before. It looks like it says it can be used with "off brand" dishes, so it seems to be a universal fit.
It is hard to make out the level of adjustability using the pictures in the pdf.
Note: This adjustable bracket can also provide dual reception with
off-brand dishes not supported with the Glorystar 4° Dual LNBF Rotating Bracket solution.
Make the center lnbf point to 103W (since it is harder to receive) and the one off to the side point to 97W.
Facing the dish the 97W lnbf will be on the left of center.
I did the same setup once. I peaked for 103W using the adjustments on the dish then locked down elevation and azimuth, then peaked for 97W using the bracket's adjustments. I also had to rotate the 97W lnbf a little toward center. Some brackets may or may not allow for this. The best homemade brackets I have seen here have full adjustability on all axies. I like a system where each lnbf can be adjusted separately. For Example, the plastic Glorystar bracket, the adjustments are not really independent of each other.
On the multi-lnb setups on my 90cm I have attempted, I always try to use existing holes in the arm if possible. My 90cm dish plus shipping costs makes it my most expensive dish, more so than my 10ft Winegard! So I am less willing to drill into it. You may have to drill however, I'm not sure.
This is a good setup to start off with and if you have good luck then try adding more sats.
Edit: Is this the one you are talking about? If so I have used this one.