1.5 is OK, 2.5 ton is better.
Like @VOLVO_V70 said, I’ll reinforce here… You ABSOLUTELY DO need stands. They are cheap, buy at least 2 and better 4.
If you lift it, it needs a jack-stand under it before you do ANY work under it or even around it. I don’t even change a wheel without a stand. If the jack fails while you are removing the tire, the car can pin your hands or worse… way worse!