C channel orientation for desk

Complete newbie just bought my first house so it’s time to finally build and create the spaces I’ve been wanting. That being said I’m looking at making a 98” desk using a butcher block style counter top. It will be 98” long, 25” wide, 1 3/4 thick I believe. There will be shelves holding it up 14” wide on each sides. So I will have a big gap and don’t want any sag and also don’t want to do any legs. I see the c channel is the answer. On what I’ve found on the internet everyone does it by doing it across the short side. One in the middle two close to the edges like I have in the picture “A”. To me it makes sense to do like two going long ways to help support the center better figure “B”. I’m sure there’s a reason for it the other way but want to make sure I’m doing it the right way before ordering materials. With the weight of the wood itself, plus my pc, 3D printer shaking and other misc stuff it will get heavy. Thank you!

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