'Abdullah (bin 'Umar) used to slaughter his sacrifice at the slaughtering place (i.e the slaughtering place of the Prophet ﷺ ) .  

كَانَ عَبْدُ اللَّهِ يَنْحَرُ فِي الْمَنْحَرِ قَالَ عُبَيْدُ اللَّهِ يَعْنِي مَنْحَرَ النَّبِيِّ ﷺ  

Ibn 'Umar said, "Messenger of Allah ﷺ used to slaughter (camels and sheep, etc.,) as sacrifices at the Musalla."  

أَخْبَرَهُ قَالَ كَانَ رَسُولُ اللَّهِ ﷺ يَذْبَحُ وَيَنْحَرُ بِالْمُصَلَّى