Neither is correct. The infinitive form of fueras and eras is ser. Ser is not used to indicate location. The infinitive you should have used is estar.
To indicate location in the past, a started and ended (a done deal), you would use the preterite (estuviste). To indicate a past location, but one that is still occurring, you would use the imperfect (estabas).
¿Estabas aquí antes?
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