Does this Dell monitor support ergonomic adjustment and mounting options?

Yes. The product description says it supports swivel, slant, height, and tilt adjustments, and it is VESA mount compatible.

What is the monitor’s native resolution and aspect ratio?

The monitor has a native resolution of 3440 x 1440 (UWQHD) with a 21:9 aspect ratio.

Questions & Answers: Dell Pro P P3426WEB 34" Class Webcam UW-QHD Curved Screen LED Monitor - 21:9 - 34.1" Viewable - In-plane Switching - LED Backlight - 3440 x 1440 - 350 Nit - 5 ms - DELL-P3426WEB

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Item#: N82E16824260975
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Dell Pro P P3426WEB 34" Class Webcam UW-QHD Curved Screen LED Monitor - 21:9 - 34.1" Viewable - In-plane Switching - LED Backlight - 3440 x 1440 - 350 Nit - 5 ms - DELL-P3426WEB

34.1" Viewable
In-plane Switching (IPS) Technology
LED Backlight
3440 x 1440
1.07 Billion Colors
350 Nit
5 ms
Speakers
Swivel, Slant, Height, Tilt
USB Type-C - HDMI - DisplayPort
VESA Mount Compatible
USB Hub, KVM Switch

$999^.99 –