Clean White Furniture – How High To Mount TV. In general, if you choose TV wall mount with 55” then the perfect viewing distance is from 6′ to 12′. For 65” TV wall installing the distance could be from 8′ to 12′. Normally, TV must be at a height of 42” under the sofa. Sure, you may vary numbers according to your room and available space. Maybe you will choose TV cabinet furniture design for walls, so take into account this detail.