Those are both very nice names! The only problem (which may not be a problem for you at all) is that Ember would probably have the nickname
Emma at some point (which is a very cute name, but waaaay too popular for me).
Some middle name ideas:
Piper LyricPiper KayleePiper AmaraPiper ElisabethPiper Abigail
Ember
LaurenEmber
AlexaEmber
CallaEmber
MayEmber Jaide