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Congrats! I have three across in my 100 Series. Diono Radian RXT. Currently the kids are 7, 4, and 4 and still using the seats. These are convertible so they go from rear facing, to forward facing to booster so worth the expense in the long run IMO. No affiliation to Diono just have been a really good buy for us and want to share.
radian rXT all-in-one convertible car seat | Diono US
Buy Buy Baby price matches Amazon so you can see it in person before you buy and can get it without waiting.
You'll need this for rear facing
Diono Radian Angle Adjuster https://www.amazon.com/dp/B006I1QTYQ/ref=cm_sw_r_cp_apa_HM3iAbPKMXMK5
The seats fold in half so are great for traveling. I bought a small collaspable hand cart to stack these and wheel them around plus these covers for travel. These were great for checking them. Diono Car Seat Travel Bag, Black https://www.amazon.com/dp/B00UBSA2UY/ref=cm_sw_r_cp_apa_LO3iAbGMGFF95
Magna Cart Personal 150 lb Capacity Aluminum Folding Hand Truck (Black/Red) https://www.amazon.com/dp/B000HVVSDU/ref=cm_sw_r_cp_apa_053iAbD4H4QTW
Sidebar. The other two greats buys for twins were the Bob Dually stroller and Ergo baby (sport version) carriers. Good luck. Remember, it will get better.