With these circumstances, would it be a good idea for me to purchase insurance from the car rental company?

Very soon, I am going to rent a car through a national rental agency for a long trip to the west (Montana, etc.) which is over a thousand miles each way.

I have, at home, a car which I have fully insured, and I get about $30 discount per month for “safe driver discount, due to not having any chargeable events (accidents). I have a $500 deductible. This insurance covers me for rental cars, too, same deductible.

I’m renting the car for about 18 days, and insurance through the rental company is $15 per day = $270 extra.

With the circumstances as I’ve described them, if you were me, would you get the additional rental insurance through the company?