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How about springing some pieces of small diameter PVC pipe between the frame and the opposite wall?
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Location: Kansas City, Kansas
Fit the pieces using painter's tape to hold for sizing.
Use the silicon on the top piece, leaving the other pieces taped, and retaping the top piece in place.
Then do the bottom piece the same way.
Then both sides, the bottom will hold them up.
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don't forget to paint the inside , back edge to match the outside. The reflection will show some of the back of the trim.
Go easy on the silicone, it doesn't take much
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Apply several small pieces of adhesive mounting tape and then use the silicone between pieces of mounting tape.
I used this technique to mount a magazine rack to the wall in my bathroom. The mounting tape itself will loosen over time, but it works instantly and will hold well for 24 hours while the silicone adhesive dries.
You only need a few very small pieces of the tape to secure it long enough to let the silicone cure.
No animals were injured or killed in the production of this post.
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I used automotive trim adhesive tape. The pieces have not moved it is a 3M product but i am not sure which #. It is at home but I can check and post the # this evening.