HDMI · EDID and scaling screen
Will both displays accept the advertised mode?
Choose the EDID policy explicitly. A splitter cannot assume two different output modes unless the exact device declares per-output processing.
Two-output plan
Resolution scaling does not prove feature conversion
Some routers downscale resolution but do not convert refresh rate, color space, HDR, VRR, audio capability, or protected-content behavior. Treat every processing feature as a separate exact-model declaration.