Shimano 105 front derailleur troubles

in Workshop
I just recently bought a bike (defy advanced 2), and noticed some chain rubbing on the front derailleur. I watched some videos and unscrewed everything to try and adjust it, I noticed I was missing the support plate as my derailleur is the brazed on version. The seat tube on my bike is D shaped and I noticed when I screwed the support screw out it ended up at the corner of the seat tube, so the plate would have to be at a 45 degree angle. The tough thing is every guide to setting up and adjusting the front derailleur includes the support plate adjustment which I do not have. Can anyone weigh in on this? Is this a normal thing and do I absolutely need this plate? I'll include some pics. Thanks for any help!
Pics: https://imgur.com/1mLsG7c https://imgur.com/mLGVQNK https://imgur.com/zUSsYrg
Pics: https://imgur.com/1mLsG7c https://imgur.com/mLGVQNK https://imgur.com/zUSsYrg
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