What are the specific resolutions and freq. supported? I understand it is "max 4K", but I also want to use it at lower resolutions (like 3440x1440)

The 3 pack of HDMI dummy plug supoorts lower resolutions like 3440x1440, 4K 2160pc, 2K 1440p, 1080p, 720p, etc.

What are the dimensions in mm of the portion that sticks out of the computer? I'm trying to see if this will work with my case.

HDMI port ghost adapter is mini size, the dimention of the part you asked about , it's 21 x 18 x 10 mm

Can you use these to mirror one display.. to another? like playing a movie or gaming on one and mirroring it through to another rooms tvs?

No. This is to create a dummy display

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