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According to Apple's specifications on this MacBook Pro all four ports support video:
Charging and Expansion
Four Thunderbolt 3 (USB-C) ports with support for:
Charging
DisplayPort
Thunderbolt (up to 40 Gbps)
USB 3.1 Gen 2 (up to 10 Gbps)
If two of the ports are not supporting video you could look at the cabling (try another cable, etc.) and ...
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In order to get this setup working, you'll want to get the following:
2 x Thunderbolt 3 to HDMI cable
1 x DisplayPort to HDMI adapter-cable
1 x USB-A to USB-C adapter
You would connect the first monitor directly into the MacBook Pro using the Thunderbolt 3 to HDMI cable.
The second monitor connects to the dock's Thunderbolt 3 connector using the ...
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You can’t use three Thunderbolt 3 ports to drive three displays. You can accomplish this by connecting two Thunderbolt 3 to HDMI adapters/cables and one HDMI to HDMI/VGA/DVI adapter via the HDMI port.
A couple of things to consider when connecting monitors:
Use native signals rather than convert. Thunderbolt 3 is also DisplayPort, so it’s better to go ...
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See https://www.apple.com/mac-mini/specs/
I think you're getting into trouble by trying to run a monitor at 75 Hz. Either lower the resolution or the refresh rate. Try 800x600@60. Once that's stable, step it up a notch until you know the limits.
I would also be susipscious of the quality of your HDMI to VGA adapter/cable. Does your monitor have an HDMI ...
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According to Apple
Up to three displays: Two displays with 4096-by-2304 resolution at
60Hz connected via Thunderbolt 3 plus one display with 4096-by-2160
resolution at 60Hz connected via HDMI 2.0 [...]
So it is important to not exceed the maximum resolution supported.
Your 1080p Monitors seem to meet that spec so you will need to look at your ...
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For the touch-bar 13" MBP the right side ports have reduced bandwidth, this could explain a portion of the difference in speed between the two modes. However, you will likely never see the full speed while running in TDM, that is because TDM runs as a UEFI application within the UEFI rom, this limits the resources that can be used in targeted disk mode. ...
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You need a Thunderbolt 3 dock - many exist. What you seem to be confused about is that they require a Thunderbolt 3 monitor - they don't. You can buy a simply cable to connect the Thunderbolt 3 port on the dock to the monitor via DisplayPort or mini-DisplayPort.
I'm using the OWC 12-port Thunderbolt 3 dock for attaching dual-monitors to the MacBook Pro ...
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If the external screen is flickering and blacking out after 3-5 sec, try going into System Preferences > Displays and change the settings for your external monitor. I solved mine by setting the Resolution to 1080p and Refresh rate to 60 Hertz.
P.S. You can bring the display settings window of the monitor to your main display on the Mac by hitting 'Gather ...
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