What if you added a bracket like what’s on this light. Then add feet that can swivel out for stability. Then the whole case can rotate to the right elevation. Thumb screws would be best here. The lnb can even stay inside the case if that wont attenuate the signal.
Another option would be to bolt one of these to the case and a cheap lnb bracket to the top.
Edit: Does dreamcatcher tolerate heat well? If you are planning on using a waterproof box that is something to consider. When using L band I used a waterproof box to house everything. Even when it was in the shade I still had overheating issues.