it should be fine

I've used 3 ton jack stand pairs for similarly weighted vehicles many times, no issues (RX350, MDX, RDX ...)  Jack in addition not required though not a bad idea for additional safety.

3 ton jack stand pair means each stand is rated for 1.5 tons for a total of 3 tons.

When using jack stand in pairs, part of the vehicle weight is on the remaining 2 wheels on the floor so not all of the 2.3 tons is on jack stands, maybe 2 tons at most?  You need 2 pairs (4 stands) to get the entire car off the floor, which you would would 6 tons total at that point.

Invest in a good jack stand pair, not all are created equal.

Jack on level floor is optimum, but sloped driveway can work if done properly, use common sense.