If glare is a problem, you might consider fabricating a hood. My old LaCie CRT (very old) came with a three-sided hood velcro-ed to the top and sides. It worked well. Some black mat board would do the trick.
I have a late-2010 Mac Pro (5,1). I bet you could pick one of those up cheap. It runs 10.6.8 and 10.13.6 on separate partitions.
iMac (19,1, 3.1 GHz i5, 12.7.4, 40 Gb RAM); MacBook Air (1.8 Ghz, 8 Gb RAM, 10.14.6, 256 Gb SSD) Vodafone router and Devolo Wi-Fi Extender, Canon TS8351 printer/scanner.
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