micromobility - Bikes, scooters, boards: Whatever floats your goat, this is micromobility

I live in Boise metro area (USA) and use a Lectric XPedition cargo ebike.

Basically I'm trying to figure out a better way to carry things for commuting to work:

• Laptop - Needs protection from weather/sprinklers and bumps. Earlier my laptop got bashed up from all the bumps and I suspect that contributed to or caused its death, and its pointy corners put holes in my waterproof pannier that I guess I need to patch somehow. I bought another laptop and wrapped it in a sweatshirt for more protection but now it is destroying my sweatshirt. So I definitely need something better, and if it's less expensive than my laptop then it's worth it.
• Other electronics - needs to go in a weatherproof container similar to my laptop
• Lunch/snacks - I want this to be separated from my electronics
• Rain clothes - Also needs to be separated from my electronics
• Emergency bike tools

Right now I have two waterproof Ortlieb panniers but they don't fit on the XPedition so I have to attach it to a basket in a wonky way but one is what I put my electronics in right now. I also have backpacks that aren't waterproof which I wear one and carry my lunch/tools in it. And two panniers designed for the ebike but neither are waterproof so I'm not using them for this.

I am most concerned about my laptop obviously and I think a cheap workaround is buying a sleeve off Amazon/Aliexpress but it's still a chaotic and poorly secured setup. I saw that there seems to be panniers and backpacks designed for this which I am considering but there are a lot of options. So I'm wondering how other people carry their valuables and items.

EDIT: I just saw that Ortlieb has an insert for carrying a laptop which looks like a decent option but a better way to attach the pannier to the bike would be nice.