If you are placing it in shadow box frame then you can glue it down with wood glue or hot glue, and sorts.
If you are placing it in insect collection drawers with plastazote foam or such thing then you can use multiple pins to go cross over their legs to hold them there.
The general term scarabs refer to
Family Scarabaeidae, which do not include stag beetles, the
Family Lucanidae.
The taxon is something like this below:
Superfamily Scarabaeoidea includes:
Family Scarabaeidae
Subfamily Aphodiinae (Small dung beetles)
Subfamily Dynastinae (Rhinoceros beetles)
Subfamily Cetoniinae (Flower beetles)
Subfamily Scarabaeinae (Dung beetles)
Subfamily Melolonthinae (May beetles)
Subfamily Rutelinae (Leaf chafers)
Family Lucanidae (Stag beetles)
Subfamily Aesalinae (
Nicagus,
Aesalus)
Subfamily Lucaninae (
Lucanus,
Prosopocoilus,
Dorcus,
Platycerus, etc.)
Subfamily Syndesinae (
Ceruchus,
Synodendron)
Family Geotrupidae (Earthboring scarab beetles)
Family Ochodaeidae (Sand scarab beetles)
Family Passalidae (Bess beetles)
Ok thanks. He was my pet and I don't want to put a pin through him. how will I mount it without a pin? And off topic, are stags scarabs?