First ever hot tub, need advice!

My partner and I are so excited and are about to purchase our first hot tub!!! Just have a few questions as we are newbies. Looking into the Dreammaker 2300s!

  1. Our backyard is cement and has a slight slope for water runoff. The woman at the hot tub store said that is ok as long as the jets are covered. Is this true? I initially thought the floor had to be completely level.

  2. The hot tub we are looking at is the Dreammaker 2300s, $5k with exterior steps, free delivery, and chemicals for a year included. Is this a good starter hot tub?

  3. Every dry sit we did at the store the hot tubs seemed so deep, I couldn't put my arms up on the sides which is why we are thinking the 2300s. Is this normal for hot tubs to be so deep like this? Also many didn't have anywhere to put cups.

  4. It says plug and play 120v with 1 KW Heater. We are in Ohio, will this work for the Winter time? We could upgrade to 240V but hiring an electrician now is just not in the budget.

THANK YOU all for any help and I'm sorry for all the questions!