Here is my strategy for 4 BDK and Holy Paladin on Mythic+ low level keys (<5):

COCP

I set up along one wall, pull the mob to the wall. This way, the knockback is easily handled. Also, by positioning along one wall, the footbombs always appear one the side away from the wall, making them easier to kick at the boss. On the Shocking Claw ability, I run the group forward and spin them around to attack the back of the mob, then run them forward again back to the wall to set up again for footbombs and the knockback. I ignore the coin grab, as it doesn't seem to matter much early in the fight, and by the time the damage ramps up, the boss is almost dead anyway.

Azerokk

DK's are just chain following/attacking each earthrager while the healer runs around trying to stay out of the bad. Death and Decay snare effect is very helpful with this. Once the Earthragers are dead, it is simple tank and spank. When Azerokk summons more earthragers, just rinse-repeat. Pretty simple at low level Mythic+.

Rixxa Fluxflame

DK's run to her and tank in place, move them out of the goo that shoots out on occasion. Otherwise, they pretty much stay in place. Rixxa aims most of her other abilities at anyone out of melee range. I drive the healer and stay on the edge of the platform for the 2 rounds of Azerite Catalyst, then move closer to Rixxa to dodge the Propellant Blast. Obviously, stay on the opposite side of the tanks for the Propellant Blast. Very predictable fight and once you get the hang of the rhythm of her abilities, it is straightforward.

Mogul Razdunk

Once again, send the DK's in to tank in place. Keep the healer out of range of the Homing Missile damage range. I ignore the Gatling Gun damage. During phase 2, DK's run after the Skyscorchers and kill them. I heal the tanks as I am able, ignoring damage from the Drill Smash. I try to keep the healer close to a pillar just in case he/she gets targeted by the Drill Smash. Once the Skyscorchers are dead, DK's follow the healer and run to the pillars in turn, heal as able. I leave the DK's by the pillar if they are targeted, otherwise run the healer solo to a pillar and keep the DK's out of damage range. Once the pillars are down, go back to the initial strategy.