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I would recommend something around the 50-60cm mark. Ideally you want to tweeter to be as close to ear level as possible, so unless you sit on the floor when you listen to Hi-Fi then 40cm is probably too low.
Excellent stands for the money. Good and strong, solid construction that can easily be mass loaded. Don't take too much notice of the level on top and you'll be fine.
I use some soundstyle ST122 which are VERY well made and sturdy. They need to be mass loaded and the top plate is a little bit small but overall they're excellent. Managed to get a great deal due to a pricing error too