I believe it is more a brown color.
Yes they will! All you have to do is ask! Home Depot employees are there to help you!
I believe it comes in 12.
Depends on what you look you are going for. I recommend the paver base gravel and sand to help level your base after digging. I self-installed so I know I didn't do it all the way correct. watch some DIY videos.
Hi Sambo. Thank you for your question. Yes the Pavestone Charcoal Concrete Retaining Wall Block Grey in. x 11.75 in. x 6.75 in. Can be purchased individually. check with your local Home Depot for available product. https://www.homedepot.com/p/4-in-x-11-75-in-x-6-75-in-Charcoal-Concrete-Retaining-Wall-Block-81103/202026928 Please let us know if we can be of further assistance. Rick_HD_OC
I'd recommend ordering what you need & having them delivered, if it's close to a pallet or more. The delivery is very helpful, & they can position it where you need it. Keep in mind qtys on hand can be incorrect online for items like this. If you prefer pickup, I'd place a will call order, & they'll take care of calling you when in stock fur your prepaid order. Hope this helps.
Stand alone works well but adhesive might be a soil idea.