We've been attaching tarps to our vehicles for years. Just two tarp poles and some tension, no need for the additional poles.
We have learned a few things - bungees are essential, steel tent pegs can become projectiles and make sure it drains in the rain.
I see you used the same cheap Amazon tarps. These are a great deal but are practically disposable, the grommets will be ripped out during the first sign of wind. I prefer the nylon tarps with webbing loops instead of grommets, they are much more durable and no worries about the damage caused by grommets rubbing against your vehicle. Brands like Chinook Technical, MSR even MEC tarps are so much better but can be 10x the cost.
and the best part, everything goes into a bag you could fit into your glove compartment.