The 900MHz option is probably only USA. Illegal in EU.
900MHz doesn't exactly need LOS, but all UHF (400MHz to 1200MHz approx) has HUGELY BETTER range LOS than not. Obviously too the 470MHz TV gives better non-LOS coverage than 790MHz TV. TV used to be up to 862MHz.
In EU there is licence free SRD in 864MHz to 868MHz. But it's low power. (SRD = Short Range Device) similar to 433MHz allocation. The EU 446MHz allows more power but only with built in aerial walkie talkies, not random function devices such as 433MHz (usually wireless weather stations, door bells and IR remote extenders, such as back channel on 2.4GHz video senders).
In general there are few Radio transmitting gadgets that are able to be EU (CE) and USA (FCC) legal. Amateur Radio doesn't have to use approved equipment for full licence in most of EU so USA 420 to 450 MHz equipment can be used by Full Licence people in most of EU as long as they only transmit in 430 MHz to 440MHz band.
Note: Just because you can easily buy a transmitting gadget doesn't make it sensible or legal in your own country.