Start by clarifying how many displays you want to drive from a single source and whether you need powered support. The hdmi splitter operating model you choose should match outputs such as 1x2, 1x4, or 1x8 and support the resolutions you require, including 4K and 1080p. Check whether the unit is passive or powered, since longer cable runs and higher refresh rates often need a power source to sustain signal quality. Consider compatibility with your source devices and any EDID handling features that keep displays in sync. Look at available materials and build quality, for example plastic versus aluminium bodies, and note the brand background of the unit like generic or RoHS to gauge reliability.