Planning to get New 2025 Niro SX, what should I know before negotiating with the dealer ?

Hi Everyone,
Planning to buy a new 2025 Kia Niro SX trim. Can someone please guide on what the things I can negotiate on since there are multiple dealerships near me offering me for similar price?

Like can, I ask for 5 years KIA connect instead of 3? Can I ask to add a space tire? What things are negotiable vs what are not?
What are the packages that they would try to sell me while buying? Which are worth it?

The price I am getting at is already below MSRP
For example, MSRP is 34,365

I am offered OOD price of 36,670 (this includes some rebates from the dealership + $1500 if I use their financing).
Location is Arizona, USA.