No prize for 'close'. You only need care about precision to the degree you care about the quality of the 'sound' it can produce. If setting one up with precision is an issue for you, you'd probably be better served with other sources. Now if just getting to hear records with music you like is all thats important, buy an inexpensive table with few set up options to eliminate angst, and enjoy your music.
How critical is the exact placement of the tonearm
When mounting a tonearm how precise does one need to be?