Am i the only one on this forum that has had to get 4 different used engines replaced due to rod knock in under 6 months?

I literally have only gotten 550 miles out of the "best" engine i had in this car.

Since a day after i bought the car it had rod knock, bought a used engine, had it swapped in, 1 week later rod knock, 3 weeks later swapped in a ANOTHER used engine, 4 weeks later rod knock.....

What could possibly keep killing this car honestly?

This car has taken almost all my savings out from under me all i ask of the skilled & experienced people on this forum is to give as many ideas as possible to why it would keep giving rod knock.

To clarify on this last engine i had i granny drove it and it lasted me 4 weeks (best out of 3) never went more than half throttle intill 60-65mph.

I have searched for months and months only to read gibberish.

Is it possible Dex-cool coolant is killing these engines? I read somewhere that dex cool will eat through plastic and cause oil+coolant mix.

Bad motor mounts?

Im really at my final terms with this car and i'm not really going to sell it for less than i paid for and im not going to sell it rigged so i just want some brainstorming and before you "vets" try to bully me and say "Search it up" trust me i have searched over this no joke 50-100 times for problems in this car every month.