So far you have asked for this forum to design your robot 3 times, this being your fourth. You shouldn’t rely on the forum to help you with these things. While im saying this now as advice because figuring this out will help you learn as a builder, it could also become a G2, G6, and R2 violation. Figuring this stuff out is part of the challenge, and you should test and experiment. It doesn’t matter if something doesn’t work if you can understand why it doesn’t work, allowing you to fix it in design iterations. That is the goal of VEX. It was made to teach kids the engineering design process and other skills. Its not about winning, its about the process it took to get there.
To answer if rings are worth it, absolutely. Alliance Goal rings can make enough points to be equal 3 goals in the alliance zone. While most teams will elevate their goals, it would then count for 1 elevated and one in the platform. It seems like not a lot compared to MOGOs, but it really does help you win most of your matches if you have it.