The necessity of separating the regular voluntary prayers when they consist of four rak'ahs by means of the closing salam

The necessity of separating the regular voluntary prayers when they consist of four rak'ahs by means of the closing salam
Regarding the four rak'ahs before the midday prayer and the four before the afternoon prayer—O Shaykh—is it possible to perform them without separating them from one another?
No, four rak'ahs before the midday prayer with two closing salams, and four rak'ahs before the afternoon prayer with two closing salams, but they are not the regular voluntary prayer of the afternoon prayer.