do you have a usb 3.0 to HDMI adapter that suports 4k on both ports?

No. The adapter is described as 1080P Full HD and has dual HDMI output.

Does this support 4k resolution for both hdmi ports - I have 2 monitors that are 2560 x 1080?

This unit supports **1080P (1920×1080)** maximum resolution for both HDMI outputs, it **does NOT support 4K output**. Your 2560×1080 ultrawide monitors will work at reduced 1920×1080 resolution, the full 2560×1080 resolution is not supported on either port. It is designed for dual‑1080P extended/mirror display.

Questions & Answers: USB 3.0 to HDMI Dual Monitor Adapter, 1080P Full HD 1 in 2 Out Multi-Screen Extender, Dual Display Extended Video Converter Compatible with MacOS, Windows 7/8/10/11 Laptops

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Item#: 9SIC24WM162711
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USB 3.0 to HDMI Dual Monitor Adapter, 1080P Full HD 1 in 2 Out Multi-Screen Extender, Dual Display Extended Video Converter Compatible with MacOS, Windows 7/8/10/11 Laptops

1-in-2 Dual HDMI Output: Drive two independent monitors for extended or mirrored screens
Crisp 1080P Full HD Resolution: Smooth lag-free video for office and multimedia use
High-Speed USB 3.0 Interface: Stable signal transmission without picture flickering
Cross-System Compatibility: Works seamlessly with MacOS and all mainstream Windows OS
Portable Multi-Screen Expander: Lightweight design for travel, meetings and home office

$34^.59 –