I would definitely not recommend these specific fork boots, I would go for traditional fork boots instead.
They are Kijima Eazy Ons
2 sizes with part numbers HD-03220 & HD-03221.
These might seem easy to install, and I bet they are, but you have confirmed my 2 main concerns:
1. the gaps are HUGE and can be seen, no matter wich direction you point them, even inwards.
2. how do you close the gaps?
glue, cement, tie wraps, combination of all those things.
Nothing is gonna help imo or it will take a long time to find "the right formula"
So when I was looking for fork boots I initially wanted to get these, but than did some research and this picture wisely made me decide not to go for these boots:
He used the tie wraps that came with it and in each ring he also uses some wiring and it still doesn't look flush to me.
Thats too much fiddling for an unfinished looking product.
I did order Kijima, but the closed ones, part number HD-03216
To make them sit nicely tight around the top, I did have to cut a small part from the top of the boot, than routed a wrap tie thru 2 holes so it sits firmly.
This is because the diameter of the fork boot is a tad too large for the forks on our CB.
This method did have as a result that I have a rather big hole on top of each fork boot...but that hole is not visable from any normal angle, unless you are looking downwards at the rear and at the top of the boot.
At the garage we first made the hole and than wrap tied it around the boot...
Afterward I redid the wrap tie thru the 2 holes.
If I had figured out that method first the hole wouldn't be that big as it is now.
But that hole leds to the fact that in a pouring rain water gets into the boot, and a simple hole at the bottom is for from sufficient to let the water out, believe me, I did.
The solution for this is simple, I can just lift up the fork boot at the bottom and the remaining water just runs out of the boot.

I'd rather not have any water sitting in the fork boot at the bottom...
With those Eazy Ons, I can imagine lifting a fork boot would rip the sensitive glue and you can start all over again.
Unless you make the boot sit water and air tight.
From a facebook member in Taiwan or Thailand
This is mine:
Here are some close ups, with white wrap ties

But the white wrap ties make it easier to see how I rerouted them on top...
And you can't even see the hole from this side view..
Here you can see the hole on top and how the the wrap ties comes in and out the top.