For the rear - the red circle is correctly located. For the front - the circle in green is where you want to jack at.
Some version of Rhino RampsWhich ramps do you have? You can use the ramps and the jack stands at the same time.
When I use jack stands, I keep my floor jack pressurized under the vehicle also, just in case.
Safety first.
the more the merrier, but I dont think one would be removing tires with a pair of ramps. Simple work like oil and fluid changes or general inspection at the very most. Jack stands or a jack positioned properly is part of the workflow as a backup. But again do at your own peril. If you feel unsafe, then please take it to a mechanic and let them tackle the work.I've seen the plastic ones crush under the weight of a vehicle. I wouldn't trust my life to plastic or cheap metal.
If you take the tires off, you can position them under the car, just in case.