Not sure on the difference between the MW5 and MW6, but I have the MW6 and it’s been absolutely flawless.
You disable wifi on your router and run CAT5 to the first node, then position the other nodes within range but not so close that they both give you full reception. From your description I think it will work fine assuming your house is not massive.
One thing to remember, the speed halves every time you go through a node. So if you’re in your lounge it will be (let’s say) 200mbit/s, if you go somewhere it has to traverse two nodes, it’ll be 100mbit, if you go further and need to traverse 3 nodes then it will halve again (50mbit).