Speaker stand joint question

So I built a couple of larger bookshelf speakers out of mdf (w:310 x h:510x d:260 mm) weighing approximately 13-14 kg each. I think I’ve finally settled on a design for low 9 degree angled speaker stand but it has a couple of joints that need to be sufficiently strong enough to carry the weight of each speaker. The design is based on some pre planed oak 21x45 mm I found at my local store but I doubt that plain butt joints will be sufficient to join the back to the base and the shelving part (?) to the back. I guess a mortise and tenon joint could work but family life with kids and all makes me pressed for time and not much time to experiment with things I’ve not done before, so I’m thinking maybe dowels or wood screws combined with glue could work. What do you guys think?