I have mine in a triangle. I saw it somewhere and liked it. So essentially

   X	
 X X

X X X X X X X

I have chests on three sides of the top lab that feed into it and then inserters between the labs that pass the bottles down. I haven’t had any backlog yet as long as theres always enough bottles in the chests. But then again, I don’t have that many labs. This is my first game (on my first planet, vulcanus, now) and I am taking my time, so I never fell behind on science yet.

Because I designed this close to the beginning of my base thats more spaghetti, there is only one belt carrying all the bottles to the chests. I wired them to a combinator each and set them so that when the boxes are over a limit, the corresponding inserter between the assembler section and the main belt turns off, so that it doesnt overflow.

I also did this because I was still experimenting with wiring. Works great!