Are you going to use negative or transparency film? Negative film has more exposure lattitude and will make it less likely that you will need a center filter. It is also a matter of taste. For the same usage, one photographer will say that they "need" the center filter, and another will say that there is no falloff, meaning that they don't find the illumination falloff inherent to the lens objectionable.
For the same lens type (e.g., the Super-Symmar XL), angles determine the falloff. So the illumination falloff of the 210 SS-XL on 8x10 would be the same as a hypothetical 105 mm on 4x5, which is virtually the same as the actual 110 mm on 4x5.
Schneider's website has PDF datasheets with graphs showing the illumination falloff of these lenses.
The SS-XL series has illumation fallof that closely follows cosine to the fourth. For the 110 on 4x5, or the 210 on 8x10, centered on the film without movements, this is a light reduction of about 1 stop to the corners compared to the center. For the 80 mm on 4x5, the falloff to the corners is 1.9 stops.
The discontinued 210 Super-Angulon / 200 Grandagon lenses had more uniform illumination.