Here is some information about installing The Edge Vent up the room in limited applications.
Yes, in situations involving exposed rafter tails/open soffits in which the attic begins a few feet up the roof instead of at the roof's lower edge it is acceptable to install The Edge Vent up the roof a few feet in an effort to achieve intake ventilation. Air Vent allows limited distances up the roof for the occasion where the rafters are exposed to the open air where the roof deck would remain at the ambient air temperature. In these cases the soffits are boxed in where they are not tied to the main attic, remaining cold to limit the amount of snow melt in front of The Edge Vent.
With regard to how far up the roof is too far: Air Vent is comfortable up to 3 feet but beyond that Air Vent would want to discuss it on a case-by-case basis. Air Vent's concern at that point is the amount of roof surface in front of the louvers on The Edge Vent that could contribute to weather infiltration. The longer the roof surfaces in front of The Edge Vent the greater the possibility it could produce conditions suitable for weather infiltration.
For all other applications The Edge Vent should be installed where the attic physically begins. If insulation is blocking the lowest section of the attic that is not a green light to move The Edge Vent above the blockage point. Instead, Air Vent recommends that the insulation fixed/adjusted.