From install
manual: -t, --target-directory=DIRECTORY copy all SOURCE arguments into DIRECTORY
. Example:
dzmitry@debian:/tmp/test$ find
.
./dir1
./dir1/file2
./dir1/file1
dzmitry@debian:/tmp/test$ install -D dir1/* -t dir2
dzmitry@debian:/tmp/test$ ls dir2
file1 file2