What is Reddit's opinion of StarTech.com 4U Universal VESA LCD Monitor Mounting Bracket for 19-inch Rack or Cabinet - TAA Compliant - Cold-Pressed Steel Bracket (RKLCDBK)?
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By popularity on Reddit, this product is:

#201 in Monitor Arms & Monitor Stands

#385 in Computer External Components

Just the first thing that came to mind. Don’t really have any first hand experience but i think it’d suit your needs just fine

Like this

StarTech.com 4U Universal VESA LCD Monitor Mounting Bracket for 19-inch Rack or Cabinet - TAA Compliant - Cold-Pressed Steel Bracket (RKLCDBK) https://www.amazon.ca/dp/B002D1GG0C/ref=cm_sw_r_cp_api_i_H0VMXC5AWNGRXZXM9WDH

I don't know if it's all that innovative, but I have a 22" monitor mounted at the top of my rack with this bracket from Amazon.

seems like a waste of space, but startech makes a vesa monitor mount.

Sorry for the long link, but I'm am using this StarTech model. It's very sturdy.

I racked a cheap thrift store monitor to my rack. I purchased this kit and spent around $20 on the monitor.

< $50

$100 - $200

< $50