My personal favourite way to connect everything, would be wired. I would have an HDMI cable from the LS60 to the TV (eARC port on the TV). This means that any sound the TV plays, be it from the TV's internal apps, or any device connected to one of the other TV HDMI ports, will go directly, via cable, to the speakers - no dropouts. Then to play music, I'd get a dedicated streaming box of my choice (Apple TV for example), and connect that to the TV via HDMI. The TV will automatically pass that to the speakers - no faffing around needed.
You can also stream directly from your phone, or laptop, to the speakers (via bluetooth, Airplay if you use apple, or Chromecast if you use Android). I don't personally like this, because it introduces 2 wireless connections into your chain (which are inherently more unstable than wired connections). Firstly, your device (laptop, phone, tablet, etc), is wirelessly connected to the internet, receiving your media, and secondly, it's wirelessly transmitting that to your speakers.
Thankfully, you're not in an either-or situation. You can wire whatever you can as per my preferred method, and stream everything else. All you need do is select the appropriate input using the KEF remote control.
As to your TV position - that's a whole new can of worms. The simple answer is sound from your speakers will reflect off hard surfaces roughly the same. It doesn't matter if it's bouncing off a TV, wall, window, bookshelf, etc - it makes little difference. If you want to control the sound, you need to do acoustic treatment, which is a deep, deep rabbit hole. Suffice to say, some people here swear by it, some think it's unnecessary, others think it's bad. All agree that for it to do anything, you need lots of thick panels spread around your room. So unless you intend to make your room look like a studio, or home theater, then feel free to put the TV wherever you like - it won't change the acoustics at all. Make sure your speakers are positioned in the way they sound best to you, then put your TV somewhere where the speakers won't block it - not for acoustic purposes, but purely so you can see the TV properly.