2017 MacBookPro how many HDMI displays are possible

MacBook Pro (13-inch, 2017, Two Thunderbolt 3 ports) - Technical Specifications - Apple Support

MacBook Pro (13-inch, 2017, Four Thunderbolt 3 ports) - Technical Specifications - Apple Support

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Simultaneously supports full native resolution on the built-in display at millions of colors and:

• One display with 5120-by-2880 resolution at 60Hz at over a billion colors
• Up to two displays with 4096-by-2304 resolution at 60Hz at millions of colors
• Up to two displays with 3840-by-2160 resolution at 60Hz at over a billion colors

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Neither of these laptops have HDMI ports, but you could connect up to two HDMI displays with the use of USB-C to HDMI adapters, USB-C docks, and/or Thunderbolt docks. To connect both displays through a single Mac host port, you'd need to attach a Thunderbolt dock to the Mac, and then attach the displays to it. But if you are willing to use two host ports, you could go with a "plain" USB-C dock that has a HDMI port built in, and a separate adapter for the second HDMI display.

You can find USB-C to HDMI adapters and adapter cables on Amazon and in many retail stores.

Your tag line indicates that you have one of these 13" 2017 MBPs, but if, by chance, you have a 15" 2017 MBP, it can drive as many as four HDMI displays (using adapters).

MacBook Pro (15-inch, 2017) - Technical Specifications - Apple Support

Hi,

As far as I know, it's only one external HDMI monitor is officially supported.