I use a 3 in 1 service like this you mention with cable modem, not Wi-Fi which is carcinogenic.
My modem is motorola a very reliable model.
The Coax cable is for TV(that i dont use) and phone.
PC use a RJ45. Modem is free lending.
So there is just 1 spliter. The service is reliable and slow, price are low.
Out side this combo prices are expensive. Splitters are OK to me.