Chris, FYI a Triplanar, and probably other 9-inch tonearms where the pivot is offset to the right of the vertical mounting shaft (e.g., 9-inch Reed or Talea), is virtually unusable with SP10 due to that "skirt", unless you can tolerate a really weird angle when the tonearm is at rest such that it extends over the right front corner of the chassis. Yes, a straight-line tonearm like yours does work fine with SP10, plinth or no plinth.
Raul, for the heck of it I went to the Home Depot website. There I searched under "laser level" and found 5 pages of choices at prices ranging from less than $20 (per Pryso) to more than $1000!