Is the Plugable USB 2.0 to DVI/VGA/HDMI Video Graphics Adapter compatible with Mac?

Yes, it is compatible with MacOS 10.14 and later versions.

What is the maximum resolution supported by the Plugable USB 2.0 to DVI/VGA/HDMI Video Graphics Adapter?

The adapter supports up to 1920x1080 resolution for each additional display.

Yes, I have been using four of these devices for over a year on Win10 Pro without any issues

I have four devices working on my Win10 Pro for over a year without issue. I can't speak to the non-Pro version, however.

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Plugable USB 2.0 to DVI/VGA/HDMI Video Graphics Adapter for Multiple Monitors up to 1920x1080 Supports Windows 11, 10, 8.1, 7, XP, and Mac 10.14+

Multiple Displays - Connect multiple USB 2.0 display adapters to your computer to expand your screen space with up to 6 additional 1920x1080 HDMI, DVI, or VGA displays (one 1080p display per adapter)
Boost Productivity - Maximize your productivity and workspace. With multiple displays, youre able to get more done in less time especially on tasks that have you working across a handful of windows and tabs
Compact and Portable - Easily stow in any backpack or laptop bag, taking up roughly the same space as a pack of playing cards. No external power adapter needed
Broad Compatibility - Drivers for Windows 11 / 10 / 8.1 / 7 / XP are available via Windows Update or download. Drivers for MacOS 10.14+ are available for download.