The physical dimensions of the MONSTRO 8K VV sensor are: 40.96 mm x 21.60 mm (diagonal: 46.31 mm). Compare the image circle of your lens to these dimensions to see if it will fit.
You can also use the RED Crop Factor Tool to check for vignetting. Set a 35mm reference frame and compare it to different resolutions on the MONSTRO 8K VV sensor.
Most Canon EF lenses are close to 35mm, so if you are shooting 8K Full Format on a DSMC2 MONSTRO 8K VV, vignetting will most likely occur.