Wisdom, Charisma, and Strength usually are not particularly valuable to D&D artificers. You will get small use out of them beyond the occasional bump to your skill check. Strangely adequate, I recommend the forest gnome more than the rock gnome. Forest gnomes acquire +1 Dexterity, which I might value more https://tortleranger91346.bloggazzo.com/27560891/how-much-you-need-to-expect-you-ll-pay-for-a-good-multiclass-table-5e