Been following your thread, can't find a place to get a EM20-G thinking of using an RM500 instead. Looks like it cover all bands that the EM20-G has.
Quectel RM500Q-GL
5G
n1/n2/n3/n5/n7/n8/n20/n28/n41/n66/n71/n77/n78/n79
LTE
B1/B2/B3/B4(66)/B5(18/19/26)/B7/B8/B12(17)/B13/B14/B20/B25/B26/B28/B29/B30/B32/B38/B39/B40/B41/B42/B43/B46/B48/B71
EM20
LTE
1/2/3/4/5/7/8/12/13/14/17/18/19/20/25/26/28/29/30/38/39/40/41/42/43/46/48/66