They aren’t that fragile, I use a case and screen protector to keep them from getting marred but I have carried naked phones in the past, they get ugly but survived.
If you get insurance from the carrier, you will pay through the nose. I think there are some non-carrier insurance options for less but never used one of them, google should lead you to them and reviews about their services.
Hope you like your phone, I just about bought the S7 when it was on sale but ended up getting a mid ranger with a really big battery.
BTW, use of Checkout 51, Ibotta, and similar couponing rebate coupons should cover the cost of the 2 S7s I just got. I am big on stuff like that. In fact today I again bowled 2 games free. Since I am getting 2 FREE games 5 days per week via Kids Bowl Free. The kids I got it for are unable to use it until June but for a one-time payment of $26, I and two other adults can bowl the 2 free games each day Mon-Fri sans kids. It started April 15 and good until end of August. Oh, and I invested in a pair of $19 bowling shoes to save the $4 shoe rental.