I don't think a straightener is necessary!

The best tip is; after you shampoo and condition your piece, comb all the hairs at the front as you want them to stay - either up or down. While it is drying, apply a little pressure to that area. E.g. if you want a comb back or spikey front, leave the piece underside up, with the hairline hairs pressed back under the base.

Use some styling gel or wax also to tame the hair when wearing.