I am close to two sets of families who each adopted multiple kids.
One family adopted 2 kids from Russia and the other adopted 2 from China.
The first family also had multiple children biologically.
Honestly, the 4 adoptions seemed much easier to me than the biological process which I've also seen many times.
This probably sounds terrible, but you can also return the adopted ones if there are any major problems
(and I've seen that happen too.)