Widespread no, but you can build a RfLink for less then 20€, and they work great in HA for sending and receiving. A sonoff rfbridge is prebuild, but does not understand KAKU plugs.
Ok for stuff you have, but for new devices, Zigbee is a better choice.
Others have already given you the answer, but since you replied to me, here’s my 2c:
Yes, you will need routers. Find a couple of smart plugs you’ll actually use and order them now, otherwise you’ll run the risk of setting everything up with your remote and having it not work from the bedroom.
No, the signal will not travel through walls. Without repeaters, it will try to bounce along your hallway walls, with some of it making into your bedroom. That walking distance of 15m doesn’t factor in bumping into every wall and rebounding, so you need to imagine how long the distance would be if you had to walk to your bedroom while blind drunk 
I suppose it depends on the walls. Here in the US most homes are stick-built, with wood framing and gypsum wallboard. Zigbee signals seem to travel pretty well through one or two of them. I’ve not read that these materials reflect 2.4GHz signals, which Zigbee users.
In fact, most home WiFi setups also use 2.4GHz and even large homes typically only use one or just a few access points to cover all rooms and halls.
I’ve installed networks in industrial environments where WiFi interference from walls was an issue. This was always in unusual situations like very thick reinforced concrete walls or metal outbuildings. In a regular office environment nothing special was done to cover multiple rooms. Often the AP was in the hall, and supported a large number of offices and conference rooms with no issue. And those walls often had metal, not wood, studs.
Granted, those APs may have higher output and better antennas than a typical Zigbee device, which would give them more reach. But the frequency band is the same and the signals behave the same way.
Anyway, that’s all theory. The test is using it in the real world. Pair your Zigbee device when it’s near your coordinator, then move it to where you want to use it. If the signal there is poor, pop in a smart plug half-way between it and the coordinator.
That’s the plan! I will report once I receive my package and everything is set up 
I received the remote control and the Zigbee stick today. It worked out of the box with ZHA. Also, the reception works well across rooms
For reference, I am using a Sonoff Zigbee 3.0 USB Dongle Plus V2 (ZBDongle-E) with the default firmware and a LoraTap 4 Button Remote Control which gets recognized as Model: TS0044, Manufacturer: _TZ3000_ee8nrt2l
Again.
After 24 replays and know hows how many people you decided that you solved this problem.
I don’t know who solved it but who ever was you should give this person a credit and not to yourself.
Well, I figured if someone stumbles upon this, they immediately see the solution as sticky and find the devices used which would be helpful… otherwise, one has to scroll through the entire conversation to find out. But I can give credit to someone else of course.
Well then please do.
To the one that hekped you the most.