Yup! placement (for me) is always upper left corner. If you are ever dealing with nap, like on a velvet or corduroy project, you can also use a safety pin to mark the nap direction.
I know I am going to need more than just 10 units per letter, but one thing at a time. With small diagonal blocks I can go up to 20 in the longest row, but they go down rapidly from there. I do have some plastic colored numbers that I will make some additional sets, color based or I'll figure something out.
All the beads are sorted into snack sized baggies. Various boring times or when I'm light on things to do at group, I would sort the beads or whatever.