SDRUM manufacture have informed me that if I use both AMP OUT and MIXER OUT, in amp I will receive only guitar signal and on mixer out drums only.
So, there is another solution with the same cost and even lower (at least in my country):
Connect SDRUM before POD and connect mixer out to mixer together with POD unbalanced output - mix them and send to amplifier. Mixer will give you much more control and, in my opinion, this type of connection is more pro.