An optional use, and a neat one. You cannot put donde into the mood tense, since it is not a verb. But switching the verb after it changes the feeling of the whole phrase.
Hazlo donde quieras · Hazlo como te gusta / Hazlo como te guste · Haz lo que prefieres / Haz lo que prefieras · Cuando necesites
So English changes how to however and what to whatever, while Spanish changes only the verb.
A command plus an "-ever" phrase gives you two mood tenses in one short sentence.
Come lo que prefieras (informal) · Coma lo que prefiera (formal) · Coman lo que prefieran (plural)
In the formal and plural versions both verbs are in the mood tense: the first for the order, the second for whatever.
Seguir behaves like elegir: the e turns into an i rather than splitting. And the verbs built on it do the same.
Irregular, with its own root: sea.
Prefiero que sea así · Sea lo que sea (whatever will be, will be)
The informal positive shortcut on hacer should give "hace". It does not: it is haz, spelled h-a-z, and sounding /hath/ in most of Spain.
Hazlo · Hazlo donde quieras
Since you follow somebody to a place, the phrase needs the a.
Te sigo adonde vayas (I'll follow you wherever you go)
You can use the plain present te sigo because wherever you go is already future context.