Is there a surface-mount component I can put on a pad, that simply has another pad on top that I can solder something on to?

I’m working on a project which requires the use of a CSP package. The product’s datasheet provides ball pitch and ball diameter but nothing about the preferred land pad diameter.
How can the pad diameter be worked out from these figures assuming an NSMD land?

I send my PCB design to manufacturer for prototype, but they send back deviated PCB samples with additional zig-zag. Why are there zig-zag lines on it? Reducing interference?