It is permissible to use a single test coupon welded in both 2G and 5G positions, or to use separate 2G and 5G test coupons. The guidance is in QW-302.3:
"...For test coupons made in both positions 2G and 5G on
a single pipe test coupon, specimens shall be removed
in accordance with figure QW-463.2(f) or figure
QW-463.2(g)."
If you look at the above figures, there is a 100 degree segment on the left side of the figure for 10" NPS, or 90 degrees for 6 or 8" NPS, that is welded in the 2G position and the remainder is welded in the 5G position. It also shows a horizontal reference line for 5G to make sure the pipe is oriented correctly while welding.