THIS IS THE RUB:
The 'start animation in the middle' isn't available on the Strips of LED's. Nor in the DIY section of the app.
I have every model of Govee strips, including the latest pro & COB that was released 3 days ago, and not one has that flexibility to give the end user the option to start animation in the middle of the strip.
My Y lights can do it.
My cube lights can do it.

And though ripple scene is available on a very small few of LED strips from govee, we still can't control the color of any of these preset scenes.
And while we can control the speed on a very select few it's frustrating that most of others you can't.
It sucks that to get this effect we have to purchase yet another strip which means another mac address on our wifi. Just to get the animation to start in the "middle"
Why does Govee push, users like me, to move everything over to WLED and forego using Govee with stuff like this is a mystery.
But I'm hoping we can all come together and talk to govee and ask that they send an update to the app to give us such an easy functionality.

I'm planning to install exactly 20 meters of LED strip lighting in an entertainment room. The room has four walls: two are 6.4 meters and the other two are 3.6 meters, making a total perimeter of 20 meters.

Ideally, I would like to cover the entire perimeter with LED strips. Does the 20-meter option come as two separate 10-meter rolls, or four 5-meter rolls? And are these segments connectable to form one continuous strip?