In principle yes, some caveats.
- Possibility 1: Let us imagine that the target orbit has zero
inclination, in this case all the satellites are launched to that
orbit and must spread themselves out, by being in slightly higher or
lower orbits until they reach equidistant spacing.
- Possibility 2: The target orbit has a non zero inclination, perhaps
because the "single spot" on the Earth has a latitude sufficiently
far from the equator to be reached from a zero degree orbit. Now the
100 satellites will need to be distributed over different planes,
possibly 100 different planes. The inclination of the planes could be
the same for all, but they would each have a different Right
Ascension of the Ascending Node, RAAN. By launching in "one shot" we
are now causing most of the satellites to have to perform a plane
change. This isn't a show stopper in principle but it can be
extremely expensive in delta-V and thus propellant terms. It may well
put such a demand on the satellites mass in propellant capacity that they
can no longer all be launched together.
In both of the foregoing examples I have assumed that the phasing along the orbit, or between planes, is carried out by the individual satellites after separation. This isn't at all necessary as the launch vehicle could perform this instead. The energy requirements would be about the same though.
As an aside the starting premise that one would need 100 satellites covers many assumptions itself - such as the beam width from ground terminals looking up, the beam width from the satellites looking down etc.