I haven’t posted in so long but I remember some of y’all were so nice and knowledgeable about car seats so taking a shot-

We are moving to NYC and I am planning on what to do about car seats. We won’t have a car and will rarely be driving. Are there safe car seats that are small and light we could keep in a closet for when we do rent a car?

LO 1 is 5 about 40lb and 42 in
LO2 is 3 about 30lb and 34 in

When LO2 grows a bit more is something like this safe?

https://www.amazon.com/hifold-fold-highback-booster-Racing/dp/B07X7H9HL3/ref=mp_s_a_1_2_sspa?dchild=1&keywords=car+seat+travel&qid=1605018459&sprefix=car+seat+trav&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFaNFVUSUNDVEtQNjkmZW5jcnlwdGVkSWQ9QTA3MDkxMTUyRDhETVVROVA3R0FFJmVuY3J5cHRlZEFkSWQ9QTAwNTQ2MDdOU0hTSkdFNUpLMUYmd2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

Any other recommendations?