You’ve heard of bunk-beds?
Contemplate the concept of bunk-graves.
Or well-fed buzzards.
That offers too much chance for public health problems. I propose individual disposal, vertically, beneath existing utility poles.
With a hydraulic service truck, remove and lift the line pole. Insert the body, either feet or head end first. Replace pole, and repeat as necessary.
I don't care if the guests of honor are completely dead yet or not. If not, they won't be going any place.